Electric-lamp lock



F. J. ONEILL.

ELECTRIC LAMP LOCK.

APPLICATION FILED AUG.I2. 191B- Patented Feb. 17, 1920.

UNITED STATES PATENT OFFIGE,

FREDERICK JOSEPH. ONEILL, OF DUNEDIN, NEW ZEALAND.

ELECTRIC-LAMP LOCK.

Application filed August 12, 1918.

To all whom it may concern:

Be it known that I, FREDERICK JOSEPH ONnnzn, a subject of King George Vof Great Britain, residing at 40 Bowling street, Dunedin, in theDominion of New Zealand, have invented certain new and usefulImprovements in Electric-Lamp Locks, of which the following is aspecification.

The main object of this invention is to prevent the unlawful removal ofan electric lamp from a bayonet joint fitting.

Other objects accomplished by the means I adopt to prevent the unlawfulremoval of the electric lamp, are; prevents arcing between the springcontacts in the socket member of the bayonet fitting and the contacts onthe face of the spigot end of the bayonet joint member; prevents endplay in the bayonet joint of an electric lamp, considerably reducesvibration and oscillation of the lamp in its socket, and thus generallyincreases the efliciency of the lamp.

In a loose bayonet fitting the spring contacts do not prevent arcing;frequently thelamp oscillating in one direction or another disengagesone or another of the spring contacts in the bayonet socket and causesarcing, creating heat in the fitting; this effects the temper of thespring contacts, and considerably reduces the efiiciency of the lamp.

In the drawings accompanying this specification,

Figure 1 is a perspective view of the lamp lock.

Fig. 2 is a perspective view of an electric lamp showing the lamp lockloosely applied to the bayonet joint connection as it would appearbefore being clenched thereon.

Fig. 3 is a view showing the lamp lock applied to the bayonet jointconnection, and clenched thereon.

I take a strip 1 of suitable material, preferably metal, approximately351- long, by e or one quarter of an inch wide, and form a circle as inFig. 1, of approximately one inch in diameter, to fit the spigot end 2of the bayonet fitting on the lamp 3, one end of the strip 1 is crimpedas at 1*, while the other end is slightly bent as at 1 to adapt it toengage with the crimp 1*.

It will be observed that when the lamp 3 is connected up, that is, thespigot end 2 of the bayonet joint which is on the lamp 3 en-Specification of Letters Patent.

Patented Feb. 17, 1920.

Serial No. 249,517.

gages with the socket member 4 of the bayonet joint, a groove 5 iscreated between the edge 1 of the socket member f of the said joint andthe enlarged portion 2 of the spigot member 2 of the said joint, thespace which creates the groove 5 being necessary for the engagement anddisengagement of the lamp with the electric light fitting.

I apply the strip 1 having the crimp end 1 and the bent end 1 to thegroove 5 in the bayonet joint, engage the bent end 1 of the strip 1 inthe crimp 1 as in Fig. 2, and with a pair of pliers or any suitable toolclench the bent end 1 within the crimp end 1 and bend them overapproximately flush with the socket member 4 0f the joint, as in Fig. 3.

The strip 1 closes up the groove 5 and prevents end play of the lamp inthe socket 4: against the influence of the spring contacts in the socketmember 4 of the bayonet joint, thus preventing the removal of the lamp,also considerably reduces oscillation and vibration of the lamp.

WVhat I claim as new and desire to secure by Letters Patent is 1. Anelectric lamp lock. comprising in combination with a lamp having itsbase formed as a shouldered spigot member and a socket member connectedto said spigot by a bayonet joint, a metal strip applied to the spaceformed by the spigot and socket members in connected position, saidstrip engaging the inner edge of said socket member and shoulder of saidspigot member.

2. An electric lamp lock. comprising in combination with a lamp havingits base formed as a shouldered spigot member and a socket memberconnected to said spigot member by a bayonet joint, a metal stripapplied to the space formed between the shoulder of said spi ot and theend of the socket member when connected, said metal strip having itsends fashioned in a manner to permit said ends to be clenched togetherafter the said strip of metal has been applied.

3. An electric lamp lock. comprising in combination with a lamp havingits base formed as a shouldered spigot member and a socket memberconnected to said spigot member by a bayonet joint, a metal stripengaging the inner edge of said socket member and the shoulder of saidspigot, the strip set my hand in presence of two subscribing having oneend crimped and the other end Witnesses.

adapted to en a 'e the said crimp and When -1 engaged both ei ids areadapted to be bent FREDBJRICK JOSEPH O NEILL over and lie approximatelyflush with the Witnesses: outside surface of the bayonet joint. ROBERTWALLS, V

In testimony whereof I have hereunto ROBERT PARK, Jnr.

